Dispersive VP-EP conformal mesh algorithm in FDTD for a CCPR model
Year: 2026
Type: article
Abstract: A dispersive volume-average polarized effective permittivity (D-VP-EP) algorithm is introduced for the analysis of arbitrarily shaped three-dimensional dispersive materials, utilizing the complex-conjugate pole-residue (CCPR) model within the finite-difference time-domain (FDTD) method. The D-VP-EP employs the fitting algorithm as the preprocessor in the frequency domain, followed by an interpolation algorithm in the spatial domain, to avoid conformal-induced changes in the form of the constitutive equations during subsequent conformal mesh generation. The D-VP-EP algorithm maintains the iterative formulation of conventional CCPR-FDTD while enabling conformal meshing between 2 dispersive materials with an arbitrary number of poles. In scattering simulations of metal-dielectric dispersive bilayer nanosphere and transmission spectrum simulations of a dispersive micro-ring, the D-VP-EP effectively reduces mesh mismatch errors at curved interfaces when compared to volume-averaged or staircase, and only needs 1/16 of the computing resources of the comparison group to achieve the same accuracy.
Source: Optics Express
DOI: 10.1364/oe.584767
Authors: Yuan Fan, Yuhao Zhou, Yanan Liu, Han Liu, Liuge Du, Xiao Xu, Fanmin Kong, Jia Zhao
Institution: Shandong University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7118176049